Triangle may refer to any of the following items:

• Triangle, a TOS novel by Sondra Marshak & Myrna Culbreath

• Triangle: Imzadi II, a TNG novel by Peter David

• The Triangle, an independent region at a conjunction of Federation, Klingon, and Romulan space. (from the FASA RPG's Star Trek: The Role Playing Game)

• The Triangle, a FASA game sourcebook detailing the Triangle (see above). (from the FASA RPG's Star Trek: The Role Playing Game)

• The Triangle Campaign, a FASA RPG game scenario book, providing four separate (but connectable) series of adventures for Starfleet Intelligence characters in the Triangle (see above). (from the FASA RPG's Star Trek: The Role Playing Game)